Patterson-Kelley MOD-04 사용자 설명서

 13 

WARNING!  

Never install a valve that can isolate the low water 
cutoff from the boiler. 

 

 

 

The boiler is not provided with external drain con-
nections.  A drain valve should be installed near the 
inlet (system return) connection to the boiler and 
piped to a suitable floor drain.  The boiler can be 
completely drained through the bottom header by 
removing the flush plug in the bottom end plate. 

This plug may also be used to flush accumulated 
sediment from the bottom of the boiler. 

 

3.8.4  Flushing and Filling 
 

Before filling the boiler, flush the system to remove 
the debris.  Clean and flush old piping thoroughly 
before installing the boiler as recommended by your 
water conditioning or chemical treatment supplier. 

Under no circumstances should the hydronic system 
be flushed while the boiler is attached to the system 
since the debris or corrosion products could accu-
mulate in the boiler and plug the boiler heat ex-
changer. 

If the piping system attached to this unit will be 
chemically cleaned, the boiler must be disconnected 
from the system and a bypass installed so that the 
chemical cleaning solution does not circulate 
through the boiler. 

 

To be sure that the boiler is not air-bound, open the 
pressure-relief valve located at the rear of the boiler.  
Leave the relief valve open until a steady flow of 
water is observed.  Close the valve and finish filling 
the system. 

The boiler is designed to operate in a closed-loop 
system.  As such, the system should be tight and not 
require make-up water.  A high percentage of un-

treated make-up water can cause premature failure 
due to buildup of scale.  Such failure is not covered 
by warranty.   

Scale can also reduce efficiency.  For example, a 
scale thickness of 1/16" will result in a 12.5% loss 
of efficiency. 

The water quality should be within the guidelines 
established by the American Boiler Manufacturers 
Association, as follows: 

•  Total solids: 

2,500 ppm 

•  Total alkalinity: 

500 ppm 

•  Total hardness: 

150 ppm 

 
The amount of oils, fats, grease, and other organic 
matter should be limited to 10 ppm.   

Consult your water conditioning or chemical treat-
ment supplier for analysis and recommendations.  

If antifreeze is to be used in the system, the cus-
tomer should perform a hazard analysis to determine 
the use and disposal of the antifreeze. 

 

 

Inspect the burners to be sure nothing was damaged 
or knocked loose during shipment.  Make sure that 
the mixer core in the top of the burner is centered in 
the burner head; (see burner photo in section on 
"Cleaning the Burner" Section 5.2).  Inspect the pi-
lot line, main gas train and ignition electrode to be 
sure they were not damaged during shipment or in-
stallation.  Check to see that the pilot is securely 
attached and that it is properly positioned to ignite 
the main burner. 

 

 

Before attempting to start the boiler, make sure the 
following items have been completed. 
 
1.  Flue gas from the boiler is properly vented.